Share optimized solutions, professional valve knowledge and industry news

What is 5k50 valve meaning?

Table of Contents
    Add a header to begin generating the table of contents

    We usually see the 5K50 mark on the valve body, which is general made of Bronze or cast iron. It’s a way of expressing nominal pressure and size by Japanese standards.
    5K is shorthand of JIS 5K, which means the nominal pressure of the valve is 5kgf/cm2 or 0.5MPa. And 10K is the shorthand of JIS10K means the nominal pressure of the valve is 10kgf/cm2 or 1.0MPa.
    And the number 50 behind of 5K means nominal valve size DN50, and generally will use 50A to expressing.
    What is the meaning of JIS?
    JIS is shorthand of Japanese industrial standard, for industrial valves and pipe steel, it has JIS B2220:2004(JPF/JSA), JIS B 2239, and JIS B 2240 standard.
    It is important to note that different materials, sizes, and valve types correspond to different hydraulic test and leak inspection standards.

    For example:
    Bronze Globe Valve,5K-25A,Flanges as per JIS B2220 – 5K, means this bronze globe valve, nominal size is DN25, Nominal Pressure JIS 5K,Manufactured in accordance to JIS F7400, the hydraulic test of shell pressure is 15kg, for seat pressure is 8kg.
    But if it’s Cast Iron Globe Valve, 5K-25A,Flanges as per JIS B2220 – 5K, same nominal size and pressure, but the hydraulic test of shell pressure should be 1.03MPa(kgf/cm2), and seat pressure should be 0.76MPa(kgf/cm2).
    Moreover, If for Cast Iron Globe Valve, 5K-350A, means DN350 of this cast iron globe valve, the hydraulic test of shell pressure change to 0.88MPa(kgf/cm2), and seat pressure should be 0.65MPa(kgf/cm2).

    One more thing that needs to be paid attention to is that the safety margin for selecting nominal pressure is significant. In the case of JIS 5K, the bronze globe valve can upper limit of 7kgf/cm2 in a static fluid at 120°C or lower. Generally, we recommended allowing a safety margin of 20% or 0.3-0.4 MPa, whichever is smaller for pressure, and a margin of about 25°C for temperature.

    Contact Us

    With expertise in valves and rich experience in the oil&gas, chemical industry, textile mills, power plants, and sugar mills. THINKTANK has become the premier manufacturer of next-generation precision control valves.

    With a customer base that includes over 42 of the world’s leading engineering&contractors and international valve brands, THINKTANK Valves offers cost-effective valves that help our customers achieve automated process control without paying high prices.

    solenoid valve in control valve

    What is SOV(solenoid valve) in Control Valve 

    Solenoid valves are often used in applications where a control valve is required to be actuated quickly to a fault position under certain conditions. It is generally designed to be in the air supply line and is an important accessory to the air control system.

    Read More
    diesel generators

    Fusible Link Valves For Diesel Generators

    The fusing link valve for the diesel generator set includes the valve body and actuator, and the valve body and actuator are fixed by a fixed bracket/yoke. The actuator of the fused valve includes the shaft, fusible link, manual/gear operator, actuator protection cover, limit switch, etc.

    Read More
    sluice gate valve

    Sluice Gate Valve 101

    The sluice gate valves are real end-of-line valves designed to hold back water with minimal leakage in applications such as drains, sump tanks, and distribution boxes.

    Read More
    condensate recovery system

    Condensate Return System

    Condensate has a large amount of heat, generally accounting for about 20-30% of the total heat of steam, and for some equipment, it can be as high as 40%.  Therefore, if high-temperature condensate can be recycled as boiler make-up water or used for secondary flash steam, it not only saves industrial water but also saves a large amount of fuel.

    Read More
    three way control valves

    Water Mixing

    Water mixing is the mixing of water at different temperatures, and the resulting mixing temperature varies at different hot and cold flows

    Read More
    uni directional knife gate valve manufacturer

    Knife Gate Valve 101

    Knife gate valves are primarily made for isolation and on-off services in systems with high suspended particle contents. Knife gate valves are particularly useful for managing viscous, corrosive, and abrasive media in addition to the slurry.

    Read More
    Joy Preview

    A good partner is a lasting and effective investment

    Focused on Control Valves & Self-Operated Pressure Regulators For Over 10 Years

    Grow Your Business is Our Top Priority. Contact Now You Will Get More Than You Expect.

    Joy Preview


    Just leave your name, email, and simple message or requirements, We will contact you within 1 hour.

    WhatsApp: +86 185 1656 9221

    Skype ID: sowell85

    Wechat ID: +86 189 5813 8289